I have been experiencing insomnia and I noticed that when I took about an hour and a half nap, the Versa didn't log it and give me a proper sleep total for the day. I've been waking up in the night and sleeping sometimes about 1 1/2 and thought I noticed it then too, but when you are sleep deprived you are not sure. I know you have to sleep 3-4 hours for a sleep breakdown, but why didn't it even register the nap without the deets.